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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
*
* Copyright (C) 2024 Guido Günther <agx@sigxcpu.org>
*/
#include <glib.h>
#include <ModemManager.h>
#define _LIBMM_INSIDE_MM
#include <libmm-glib.h>
#include "mm-common-helpers.h"
#include "mm-helper-enums-types.h"
#include "mm-cbm-part.h"
#include "mm-charsets.h"
#include "mm-log.h"
#include "mm-sms-part-3gpp.h"
#define CBS_DATA_CODING_GROUP_MASK 0b11110000
#define CBS_DATA_CODING_LANG_GSM7 0b00000000
#define CBS_DATA_CODING_GSM7 0b00010000
#define CBS_DATA_CODING_UCS2 0b00010001
#define CBS_DATA_CODING_GENERAL_NO_CLASS 0b01000000
#define CBS_DATA_CODING_GENERAL_CLASS 0b01010000
#define CBS_DATA_CODING_GENERAL_CHARSET_MASK 0b00001100
#define CBS_DATA_CODING_GENERAL_GSM7 0b00000000
#define CBS_DATA_CODING_GENERAL_8BIT 0b00000100
#define CBS_DATA_CODING_GENERAL_UCS2 0b00001000
#define CBS_DATA_CODING_UDH 0b10010000
struct _MMCbmPart {
guint16 serial;
guint16 channel;
guint8 num_parts;
guint8 part_num;
gchar *text;
MMSmsEncoding encoding;
};
MMCbmPart *
mm_cbm_part_new_from_pdu (const gchar *hexpdu,
gpointer log_object,
GError **error)
{
g_autofree guint8 *pdu = NULL;
gsize pdu_len;
/* Convert PDU from hex to binary */
pdu = mm_utils_hexstr2bin (hexpdu, -1, &pdu_len, error);
if (!pdu) {
g_prefix_error (error, "Couldn't convert 3GPP PDU from hex to binary: ");
return NULL;
}
return mm_cbm_part_new_from_binary_pdu (pdu, pdu_len, log_object, error);
}
MMCbmPart *
mm_cbm_part_new_from_binary_pdu (const guint8 *pdu,
gsize pdu_len,
gpointer log_object,
GError **error)
{
MMCbmPart *cbm_part;
MMCbmGeoScope scope;
guint offset = 0;
guint16 serial, group;
int len;
g_autofree gchar *text = NULL;
cbm_part = mm_cbm_part_new ();
mm_obj_dbg (log_object, "parsing CBM...");
#define PDU_SIZE_CHECK(required_size, check_descr_str) \
if (pdu_len < required_size) { \
g_set_error (error, \
MM_CORE_ERROR, \
MM_CORE_ERROR_FAILED, \
"PDU too short, %s: %" G_GSIZE_FORMAT " < %u", \
check_descr_str, \
pdu_len, \
required_size); \
mm_cbm_part_free (cbm_part); \
return NULL; \
}
/* Serial number (2 bytes) */
PDU_SIZE_CHECK (offset + 2, "cannot read serial number");
serial = pdu[offset] << 8 | pdu[offset+1];
scope = CBM_SERIAL_GEO_SCOPE (serial);
switch (scope) {
case MM_CBM_GEO_SCOPE_CELL_NORMAL:
mm_obj_dbg (log_object, " normal cell cbm scope");
break;
case MM_CBM_GEO_SCOPE_PLMN:
mm_obj_dbg (log_object, " plmn cbm scope");
break;
case MM_CBM_GEO_SCOPE_AREA:
mm_obj_dbg (log_object, " area cbm scope");
break;
case MM_CBM_GEO_SCOPE_CELL_IMMEDIATE:
mm_obj_dbg (log_object, " immediate cell cbm scope");
break;
default:
mm_cbm_part_free (cbm_part);
g_set_error (error,
MM_CORE_ERROR,
MM_CORE_ERROR_FAILED,
"Unhandled cbm message scope: 0x%02x",
scope);
return NULL;
}
cbm_part->serial = serial;
offset += 2;
/* Channel / Message identifier */
PDU_SIZE_CHECK (offset + 2, "cannot read channel");
cbm_part->channel = pdu[offset] << 8 | pdu[offset+1];
offset += 2;
PDU_SIZE_CHECK (offset + 1, "cannot read encoding scheme");
group = pdu[offset] & CBS_DATA_CODING_GROUP_MASK;
/* Order matches 3GPP TS 23.038 Chapter 5 */
if (group == CBS_DATA_CODING_LANG_GSM7) {
cbm_part->encoding = MM_SMS_ENCODING_GSM7;
} else if (pdu[offset] == CBS_DATA_CODING_GSM7) {
PDU_SIZE_CHECK (offset + 4, "cannot skip lang");
offset += 3;
cbm_part->encoding = MM_SMS_ENCODING_GSM7;
} else if (pdu[offset] == CBS_DATA_CODING_UCS2) {
PDU_SIZE_CHECK (offset + 3, "cannot skip lang");
offset += 2;
cbm_part->encoding = MM_SMS_ENCODING_UCS2;
} else if ((group == CBS_DATA_CODING_GENERAL_CLASS) ||
(group == CBS_DATA_CODING_GENERAL_NO_CLASS) ||
(group == CBS_DATA_CODING_UDH)) {
guint16 charset = pdu[offset] & CBS_DATA_CODING_GENERAL_CHARSET_MASK;
/* We don't handle compression or 8 bit data */
if (charset == CBS_DATA_CODING_GENERAL_GSM7)
cbm_part->encoding = MM_SMS_ENCODING_GSM7;
else if (charset == CBS_DATA_CODING_GENERAL_UCS2)
cbm_part->encoding = MM_SMS_ENCODING_UCS2;
} else {
mm_cbm_part_free (cbm_part);
g_set_error (error,
MM_CORE_ERROR,
MM_CORE_ERROR_FAILED,
"Unhandled cbm message encoding: 0x%02x",
pdu[offset]);
return NULL;
}
offset++;
PDU_SIZE_CHECK (offset + 1, "cannot read page parameter");
cbm_part->num_parts = (pdu[offset] & 0x0F);
cbm_part->part_num = (pdu[offset] & 0xF0) >> 4;
offset++;
switch (cbm_part->encoding) {
case MM_SMS_ENCODING_GSM7:
len = ((pdu_len - offset) * 8) / 7;
break;
case MM_SMS_ENCODING_UCS2:
len = pdu_len - offset;
break;
case MM_SMS_ENCODING_8BIT:
case MM_SMS_ENCODING_UNKNOWN:
default:
g_assert_not_reached ();
}
PDU_SIZE_CHECK (offset + 1, "cannot read message text");
text = mm_sms_decode_text (&pdu[offset],
len,
cbm_part->encoding,
0,
log_object,
error);
if (!text) {
mm_cbm_part_free (cbm_part);
return NULL;
}
cbm_part->text = g_steal_pointer (&text);
return cbm_part;
}
MMCbmPart *
mm_cbm_part_new (void)
{
return g_slice_new0 (MMCbmPart);
}
void
mm_cbm_part_free (MMCbmPart *part)
{
g_clear_pointer (&part->text, g_free);
g_slice_free (MMCbmPart, part);
}
#define PART_GET_FUNC(type, name) \
type \
mm_cbm_part_get_##name (MMCbmPart *self) \
{ \
return self->name; \
}
PART_GET_FUNC (guint, part_num)
PART_GET_FUNC (guint, num_parts)
PART_GET_FUNC (const char *, text)
PART_GET_FUNC (guint16, channel)
PART_GET_FUNC (guint16, serial)
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